/Engine/Plugins/MeshPainting/Source/MeshPaintEditorMode/Public/MeshPaintModeHelpers.h
bool RetrieveViewportPaintRays ( const [FSceneView](API\Runtime\Engine\FSceneView) * View, [FViewport](API\Runtime\Engine\FViewport) * Viewport, [FPrimitiveDrawInterface](API\Runtime\Engine\FPrimitiveDrawInterface) * PDI, [TArray](API\Runtime\Core\Containers\TArray)< [FPaintRay](API\Plugins\MeshPaintEditorMode\UMeshPaintModeSubsystem\FPaintRay) > & OutPaintRays )